Which of the following structural motifs are notcommonly found in the DNA-binding motifs of proteins that act as transcriptional regulators?
A. homeodomain
B. leucine zipper
C. ?-barrel
D. helix-turn-helix
C
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In the figure above, representing transcription, the item labeled "C" is
a. the nontemplate strand. b. RNA-DNA hybrid. c. the template strand. d. DNA double helix. e. the RNA copy.
A person choking on a piece of food____
a. cannot talk, breathe, or cough b. can cough but cannot breathe or talk c. can talk and cough but is unable to breathe d. can breathe through their nose if they remain calm e. can breathe but cannot talk or cough
The hypothesis that organic molecules formed near deep sea hydrothermal vents is called the:a
iron-sulfur world hypothesis. b. iron-clay hypothesis. c. organic sea hypothesis. d. prebiotic soup hypothesis. e. sulfur vent hypothesis
What biome has the highest rate of primary productivity?
a. savanna b. tundra c. algal beds and reefs d. temperate grassland e. tropical rain forest